[vtkusers] vtkSelectVisiblePoints and vtkPolyData Issue

[alanwsx]

Hi, 

I am writing some code to do the depth test for some vtkPolyData object, and
I want to use vtkSelectVisiblePoints class in a qvtkwidget. However, I
always got 0 points. 


Following is the minimum code: 


// in the qvtkwidget class: 
        visible_filter = vtkSmartPointer<vtkSelectVisiblePoints>::New(); 
        visible_filter->SetInputData(poly_data); 
        visible_filter->SetRenderer(renderer); 
        visible_filter->Update(); 
 

// in the overriding vtkInteractorStyleTrackballCamera class: 
        this->visible_filter->Update(); 
        qDebug() << "There are currently: " <<
this->visible_filter->GetOutput()->GetNumberOfPoints() << " visible."; 


I am not sure whether this is related to QT or vtkPolyData, since in the
official example, they used SetInputConnection(), but here I used
SetInputData(). Any suggestions would be appreciated.



Thanks, 


Shangxuan



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